Mechanical stoker.



W. R. WOOD.

acumen swoxza.

APPLIOATZO! FILED JUNEZ. 1908.

987,661 Patented Mar. 21,1911.

3 SHEETS-SHEET 2.

Fig. 2.

W i [n6 s 585: Inventor,

Af/o n96 ITEI) STATES PATENT OFFTCE WILIBELD WOOD. F LQNDON, ENGLAND. AQSIGNOR TO THE AMEBIL'ZMJ STQKEB GOIYKP'LNY, OF ERIE. PEKHEYLYANIA, A 6031303511011 QF NEW YQEK. i

" 1 o MECHANICAL some.

which an endless chain formed oi pivoted links is caused to pass from a sprocketwheel approximately beneath the fuel feed hopper to :1 second sprocket wheel at. the back of the furnace where the chains encounter a stripper plate which removes the ina-misumed fuel or refuse which passes them-c to the ash-pit. The air to support combustion is usually If not always supplied by induced or i natural draft passing out between the links of the endless chain. rally of greater depth and of closer texture, taken as a mass. at the feed end, than it is at the rear end after partial consumption and coking, diiliculty has been experienced in securing equality of combustion and suitable distribution of air throughout the length of the fire-chamber.

To obviate this drawback is one of the objects of this invention. I

Another object of the invention relates to a simple construction of traveling chain grate whereby transverse air-boxes are provided under the grate.

In the accompanying three sheets of drawings which form a part of this application- Figure 1 'is a sectional elevation of a furnace showing a stoker constructed in accordance with this invention. Fig. 2 is a plan view showing the draft boxes, the grate -bars being omitted. Fig. 3 is a cross sect-ion on the line ZZ of Fig. 1. Figs. 4 and 5 are 1 respectively a sectional ele ation and a cross section of a modified form of endless chainrate, 111 which the links are at the outer Spacification of Letters Patent. Pafiefltgd 2 131, 21, Application filed 1!;218 4 mos Serial m 436,611.

As the coal is natusivc, there is a hopper l and sprocket wheels 2 2 carrying an endless chain-grate consisting of links 3 3 flfu'; which project T-pieces 4 l to which on one side of each is attached an angle piece 5, which, in conjunction with the piece 4 on the link next in order, forrns the top or outer face of a transverse an' box when traveling horizontally. All the parts described as connected with each link,

(Jr-pair of links, may be made as a single casthng. Thi results in a traveling chairr grate cons-fixing of transverse box sections linked; together iiorrnetl o a bottom section V as: the link. an uprightsect 'n cast therewith, and an attached angle sction sccured to the upright section, the outer end of he attached section being formed to pass jusi over the upright section of the links nest in order when traveling horizontally, 1 not when traveling around the inner procket wheel any small dust which may possibly have crept in will be discharged by gravity from the then open sides of the boxes. The top sections of the boxes are provided with holes or grate openings ll for the admission of air to the fuel. The lower CllOIlS or T-pieceshave their bottom flanges '5 turned up at an angle at. the ends and pieces cut out so that each will make with the sections next in order openings or ports l0 for the admission of air to the boxes. These ports are opposite longitudinal slots in fixed draft boxes 8 8.

The air to support combustion enters from pipes 7 7 into the draft boxes, passing thence through openings 9 9 to the ports in the transverse boxes of the chain-grate, and thence through the grate openings to the fuel. The amount of air passing to the ports in the transverse boxes may he governed by plates or grates 12 12 hinged in each of the draft boxes and raised or lowered by suitable lever and crank connections from outside the furnace wall. Each plate or gate is tapered so that when raised full draft is open only to the transverse boxes near the front and gradually decreases the opening into the boxes toward the rear where it is practically closed. W'hen the plate is lowered full draft is open to all of the boxes which underlie the fuel.

In the construction illustrated in Figs. 4 and 5 depending plates 4 4' are fastened to or form part of the links and pass over a fixed plate 14 while carrying the fuel for ward. The chain-grate and depending plates form with the fixed plate transverse airboxes which are carried forward with the rate. The air inlets to the boxes thus ormed are governed as before described.

What I claim, and desire to secure by Let ters Patent of the United States, is

i. In a furnace, the combination with an endless traveling chain-grate having a series of transverse an boxes in communication tower 'the tMIXSVEISEfllI-bOXBS may be decreased plates le ndin toward the rear, substantially as described. 2. In a furnace, the combination with an endless traveling chainate,-of a series of there mm, a fixed plate over whic the epending plates are caused to be passed, whereby transverse air-boxes are fcrmw whlch are armed Zea-were. with the grate, a draft box having a port parallel with the line of travel of the grate and 00mmunicating with the transverse air-boxes of the grate, and a tapered gate decreasing the width of the port toward the rear, whereby the air admitted to the tranverse air-boxes may be decreased toward the rear, substantiaily as described;

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

VVILFRED Witnessesz r B. HENDERSON, H. Wooncmrr.

ROTHERY WOOD. 

